Balanced engine.



PATBNTED MAY 22, 1906.

H. L. TOWLE.

BALANCED ENGINE. APPLICATION FILED NOV. 20, 1905.

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WIIWESSES f g m 5 MM No. 821,553. PATENTED MAY 22, 1906.

H. L. TOWLE. BALANCED ENGINE.

AiPLIOATION FILED NOV. 20, 1905.

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HERBERT L.- TOWLE, OF RICHMOND HILL, NEl/V YORK, ASSIGNOR TO THE VVATERBURY TOOL COMPANY, OF IVATERBURY, CONNECTICUT, A COR- PORATION.

BALANCED ENGINE.

Specification of Letters Patent.

Patented May 22, 1906.

Application filed November 20, 1905. Serial No, 288,126.

To all whom it may concern:

Be it known that I, HERBERT L. TOWLE, a citizen of the United States, residing at Richmond Hill, county of Queens, State of New York, have invented a certain new and useful Improvement in Balanced Engines; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

My invention relates to reciprocating engines," and the object of my improvements is to provide a reciprocating engine that shall occasion little or no vibration while working. I accomplish this object in the engine illustrated in the accompanying drawings, in which Figure l is a sectional plan view of an engine embodying my invention. Fig. 2 is a sectional longitudinal elevation of the same, the section being taken on the line 2 2, Fig. 3. Fig. 3 is a cross-sectional elevation, the section being taken on the line 3 3, Fig. 1.

I have shown an engine having two cylinders A A, opposed to each other, and pistons B B therein secured to opposite ends of the same piston-rod.

H is a crank-case uniting the two cylinders.

D D are cross-heads forming a scotch yoke upon the piston-rod C.

E is a sleeve having spur-wheels e e at each end. The sleeve E is pivoted upon the piston-rod C between the cross-heads D D.

F F are crank-pins secured, respectively, upon the cranks or disksff upon. the shafts G G. Upon the crank-pins F F are pivoted blocks I, having racks d formed upon them. The racks d mesh with the gear-wheels e c.

The blocks I are adapted to reciprocate at right angles to the piston-rod O between guides upon the cross-heads D.

The reciprocating motion of pistons B and piston-rod O is communicated to the blocks I through the cross-heads D D and from said blocks to the crank-pins F F and shafts G G. The gear-wheels e c, meshing with the racks d, constrain the disksff to turn in opposite directions with equal angular velocities.

f 2 f 2 are counterweights secured upon the crank-pins F F to cause a rocking motion of the engine in the position shown in Fig. 3 and in position adjacent thereto, the pin F and the block I thereon having a vertical tend ency upward by reason of its centrifugal force, and the pin F and the block thereon a downward force, so that they would occasion a torque or turning moment about an axis coincident with. the axis of the piston-rod C. To counteract this effect, the balance-weights f 2 f 2 are located close to the vertical plane through the axis of the piston-rod O and at such a distance therefrom that the product of their centrifugal forces into their distance from said plane is equal to the product of the centrifugal forces of the crank-pins and attached blocks multiplied by their distances from said plane. Thus the torques of the centrifugal forces of the balance-weights is equal and opposite to and completely balances the torque or turning moment of the pins and attached blocks. The webs of the disksff are cut away, as indicated at f f so that the more Weight may be put into the counterweights f 2 f which are nearer the plane through the axis of the piston-rod.

l/Vhat I claim is 1. In an engine, two cranks arranged to turn in opposite directions, crank-pins thereon, a reciprocating part adapted to actuate saidcranks, counterweights connected with said cranks adapted to balance the inertia of the reciprocating parts, said weights being so located that the turning moment due to their centrifugal forces shall be substantially equal to the turning moment due to the centrifugal forces acting on the crank-pins 2. In an engine, two cranks arranged to turn in opposite directions, crank-pins thereon, a reciprocating part adapted to actuate said cranks, counterweights connected with said cranks adapted to balance the centrifu- I axis due to the centrifugal forces acting on gal force of the crank-pins, and attached rethe crank-pin. 1o volving parts, and also to balance the inertia In testimony whereof I sign this specificaof the reciprocating parts, said Weights being tion in the presence of tWo Witnesses.

so located that the turning moment about HERBERT L. TOWLE. the axis of the reciprocating part due to their l/Vitnesses: centrifugal forces, shall be substantially HARRY A. ANDERSON,

equal to the turning moment about the same ELIZABETH W. ToWLE. 

